Chapter 9 · Class 10 ICSE · Formula Sheet

Probability Formulas — Class 10 ICSE

Apply probability rules to compound events, conditional probability basics, and tree diagrams.

Key Formulas

Probability

P(E) = \dfrac{n(E)}{n(S)}

Complement

P(\bar{E}) = 1 - P(E)

Addition Rule

P(A \cup B) = P(A) + P(B) - P(A \cap B)

Worked Examples

1Using: Probability

A die is thrown. Find P(getting an even number).

Step 1: Even outcomes: {2, 4, 6} = 3.

Step 2: Total outcomes = 6.

Step 3: P = 3/6 = 1/2.

Answer: 1/2

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More Class 10 ICSE Formulas

Commercial Mathematics (Banking & GST)Quadratic EquationsCoordinate GeometrySimilarityCircles (Tangents & Secants)Mensuration (3D Solids)

Frequently Asked Questions

How many formulas are in Class 10 ICSE Probability?+
There are 3 formulas in the Probability chapter for Class 10 ICSE. Each formula is essential for solving problems in this topic.
How to remember Probability formulas easily?+
Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.
Are these Probability formulas enough for exams?+
Yes, these formulas cover the complete ICSE Class 10 syllabus for Probability. Practice applying them to different types of questions for full exam readiness.

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